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Considerations of Connecting Rod, Piston and Gudgeon Pin in Reciprocating Air Compressor

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Considerations of Connecting Rod, Piston and Gudgeon Pin in Reciprocating Air Compressor AIJREAS VOLUME 3, ISSUE 12 (2018, DEC) (ISSN-2455-6300)ONLINE Anveshana’s International Journal of Research in Engineering and Applied Sciences CONSIDERATIONS OF CONNECTING ROD, PISTON AND GUDGEON PIN IN RECIPROCATING AIR COMPRESSOR POTTE PENJERI BABU Mr.P.IRSHAD KHAN M.Tech (MECH), Department of Assistant Professor, Department of Mechanical Engineering, Helapuri Mechanical Engineering, Helapuri Institute of Technology and Science, Institute of Technology and Science, Eluru, A.P. Eluru, A.P. Abstract industries. Compressors can be classified according to the pressure delivered: A compressor is a machine providing air at high pressure and work is done on the gas by external 1. Low-pressure air compressors (LPACs), agency. The process of compressing of air requires which have a discharge pressure of 150 psi that work should be done upon it. The air compressor is a device that converts power into or less kinetic energy by compressing and pressurizing air there are two types of methods for air compression 2. Medium-pressure compressors which are positive displacement or negative have a discharge pressure of 151 psi to displacement. Reciprocating compressors is a 1,000 psi positive displacement type are used in some of the most critical and expensive systems at a production 3. High-pressure air compressors facility, and deserve special attention. Gas (HPACs), which have a discharge pressure transmission pipelines, petrochemical plants, above 1,000 psi They can also be refineries and many other industries all depend on this type of equipment. Due to many factors, classified according to the design and including but not limited to the quality of the initial principle of operation: specific at ion/design, adequacy of maintenance practices and operational factors, industrial 1. Rotary-screw compressor facilities can expect widely varying lifecycle costs and reliability. 2. Turbo compressor Keywords: Connecting rod, Air compressor, A. Displacement Type There are numerous Piston, Modeling, Analysis methods of air compression, divided into either positive displacement or roto- 1. INTRODUCTION dynamic types. The various definitions of The Energy B. Positive Displacement Positive- consumption of air compressor in the displacement compressors work by forcing improving efficiency of the reciprocating air into a chamber whose volume is compressor to improve the compressors decreased to compress the air. Once the performance that can be improves the maximum pressure is reached, a port or electric motor efficiency, internal losses valve opens and air is discharged into the system effects, speed variation and outlet system from the compression interaction of valve stress and compressor chamber. performance. To improve the heat transfer in reciprocating compressor using element C. Dynamic Displacement Dynamic methods. Reciprocating compressor is one displacement air compressors include of the most popular machine uses in the centrifugal compressors and axial Anveshana’s International Journal of Research in Engineering and Applied Sciences EMAILID:[email protected],WEBSITE:www.anveshanaindia.com 22 AIJREAS VOLUME 3, ISSUE 12 (2018, DEC) (ISSN-2455-6300)ONLINE Anveshana’s International Journal of Research in Engineering and Applied Sciences compressors. In these types, a rotating acting free piston expander for power component imparts its kinetic energy to recovery in transcritical CO2 cycle the air which is eventually converted into pressure energy. These use centrifugal [1]. Senegal developed new method of force generated by a spinning impeller to thermodynamic computation for a accelerate and then decelerate captured air, reciprocating computer simulation by Si – which pressurizes it. Yieng However, the fault diagnosis of [2]. W. Norman Shadeetal. suggest reciprocating compressors is one of the optimization and revitalization techniques most widely used, but utilize it for on compressors used in air drilling, air machinery protection. It also explains that procession and air separation etc. and there are really load limits based on the emphasis on the fact that virtually any size running gear (moving parts such as model can be considered for pistons, rods, crosshead, crank throw, etc.) improvements, A. Al masi worked on as well as load limits based on the reciprocating compressor design and stationary components (frame, crosshead manufacturing with respect to guide, etc.). The basic kinematics and performance, reliability and cost. And forces mechanism m will be reviewed to suggested methods for optimum least understood reciprocating still a reciprocating compressor. A P. Budagyan difficult task however, the term “rod load” and P.I. Plastinin devoted on design and is I compressor descriptors in industry. optimization on reciprocating compressors Typical end users know users, analysts, and minutely studied the effect of OEMs, etc. “Rod that rod load is don’t temperature variation on the overall general have a good developed and how to performance of the reciprocating provide a better understanding of the compressors and cooling of compressors various definitions that are used. [3]. Today, connecting rods are best known through their use in internal 2. LITERATURE REVIEW combustion piston engines, such as The heat transfer carried out in automotive engines. These are of a reciprocating compressor which was distinctly different design from earlier leading to loss of volumetric efficiency forms of connecting rods, used in steam B.G. Shivaprasad stated that Regenerative engines and steam locomotives. heating of the gas in the absence of any heat source is considered to be one of the 3. BOUNDARY CONDITIONS primary contributors to suction gas Axial stress developed and fixed heating. The experiments conducted to constraints on the CR are the real time measure the cylinder wall heat transfer rate boundary conditions which are seen in Eco in order to verify earlier imperial models Boost Mustang Engine. Axial Stress- used for prediction, and to assess the Axial stresses are developed due to the capacity loss resulting from regenerative Combustion Chamber pressure (CC) heating. Heinz P Bloch and John J.Hoefner worked on the Development of a Double Inertia Force Combustion chamber pressure (CC) - High value of axial Anveshana’s International Journal of Research in Engineering and Applied Sciences EMAILID:[email protected],WEBSITE:www.anveshanaindia.com 23 AIJREAS VOLUME 3, ISSUE 12 (2018, DEC) (ISSN-2455-6300)ONLINE Anveshana’s International Journal of Research in Engineering and Applied Sciences stresses is developed due to compressive operation is performed and make assembly pressure developed inside the combustion a single model for analysis results. chamber due to the combustion of fuel [5]. B. Mesh sensitivity analysis The purpose of conducting this analysis is to get accurate output solution. In this thesis, it is carried out to fin exact stress and fatigue plots. The relationship between input value and output values are understood using mesh sensitivity analysis. Output results were studied for different input element sizes from 8mm to 2 mm (element size). 4. CAE ANALYSISFOR FS AND AA Figure 1. Piston- Combustion chamber and piston connecting rod A. MESH AND MESH SENSITIVITY Solving a complex body to find the results of stress and fatigue life without using Finite element analysis is tedious and takes a lot of man hours and often results in human errors in solving complex equations. In 1943 an efficient way to solve complex problems related to a component was introduced by R. Courant [13]. He discretized the whole component Figure No 2: Connecting Rod Meshing into small elements, this process of Model breaking down the body is called meshing. This small elements are solved individually for solutions. Then solution of each individual element is summed up to get a final solution. One should understand that the obtained solution are not exact, but are approximate solutions which Engineers can trust. Mesh- A very fine mesh was created at the critical areas like fillet region and edges of the CR. These are the sections in the CR where there is probability of max. stress concentration. Figure 3: Total Deformation Mesh connections are created in the assembly for connectivity while mesh Anveshana’s International Journal of Research in Engineering and Applied Sciences EMAILID:[email protected],WEBSITE:www.anveshanaindia.com 24 AIJREAS VOLUME 3, ISSUE 12 (2018, DEC) (ISSN-2455-6300)ONLINE Anveshana’s International Journal of Research in Engineering and Applied Sciences leads to irreparable engine. According to survey it says 90% of the connecting rod failure is due to the fatigue. In this thesis, fatigue analysis is carried out to see if the connecting rod fulfills infinite life requirement, also if the connecting rod fails, further analysis is carried out to find value of the stress for which the life of the CR increases to infinite and giving FOS of value 2. Figure 4: Directional Deformation (x axis) 1. Minimum life of the CR is 504 cycles only. 2. CR is at high risk of failure as the min. life of the component is 504 cycles only. 3. It is the responsibility of the Engineer to redesign the CR to give fatigue life of 10E6 cycles. In general practice for steel material, CR is designed for infinite cycles. Fatigue redesign for forged steel connecting rod 5. CONCLUSION Figure 5: Maximum Shear Elastic Strains Aluminum7075 weights three times less than Forged Steel; this material When the connecting rod is applied Connecting Rod is mainly used in repeated cyclic loads, like pressure and aerospace application. inertia force, the material begins to weaken, this is known as fatigue. When Forged Steel has very high stress the material is subjected to repeat cyclic handling capacity without yielding. loading there will be progressive and localized structural damage . The stress Deformation is Forged Steel is less developed will be always less than the compared to Aluminum7075. yield stress and ultimate stress, however Also with application of 17.7 MPa due to repeated loading; the material will pressure and 1000 N inertia force, Forged fail from generations of crack to brittle Steel has better values of stress, material like failure.
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